Locks – Operating mechanism – Key
Patent
1992-05-08
1993-06-29
Gall, Lloyd A.
Locks
Operating mechanism
Key
70359, 70409, 70493, E05B 2706
Patent
active
052223833
ABSTRACT:
A cylinder lock has a cylindrical plug which is formed with a longitudinally extending keyway and which has a plurality of pin tumblers extending into the keyway. Each of the pin tumblers has a cylindrical outer part and a concentric inner part telescopically slidable within the outer part. A key is inserted into the keyway and has a tumbler activating side which is formed with a longitudinally extending groove, a groove base having projections and/or recesses formed therein and a pair of upwardly extending key blades joined by the groove base. The inner part of each of the pin tumblers has a distal end which extends into the groove and which engages a corresponding one of the projections and/or recesses. The key blades are formed with matching key bit grooves which engage the outer parts of the pin tumblers. Each of the key bit grooves has a groove bottom which is disposed above the groove base, thereby permitting a relatively large difference between the lengths of the inner and outer parts of the pin tumblers so as to increase correspondingly the number of possible lock combinations and the difficulty in picking the cylinder lock.
REFERENCES:
patent: 917365 (1909-04-01), Schoell
patent: 1095500 (1914-05-01), Hansen
patent: 1438336 (1922-12-01), Schroeder
patent: 2030836 (1936-02-01), Full et al.
patent: 3742744 (1973-07-01), Lumme
patent: 4142389 (1979-03-01), Bahry et al.
patent: 4429554 (1984-02-01), Litvin et al.
patent: 4478061 (1984-10-01), Preddey
patent: 4603565 (1986-08-01), Strassmeir
patent: 4760722 (1988-08-01), Fann et al.
patent: 4823575 (1989-04-01), Florian et al.
patent: 4856309 (1989-08-01), Eizen
Fann Yaw-Shin
Kuo Ching-Chuan
Wu Rong-Faa
Gall Lloyd A.
Tong-Lung Metal Industry Co. Ltd.
LandOfFree
Cylinder lock does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Cylinder lock, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Cylinder lock will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1747537